Postretirement Health Care and Life Insurance Benefits (One Percentage Point Change In Assumed Health Care Cost Rates Would Have The Following Effects) (Details) $ in Millions |
12 Months Ended |
---|---|
Jan. 30, 2016
USD ($)
| |
Postretirement Medical Plans with Prescription Drug Benefits [Abstract] | |
Effect on total of service and interest cost, 1 - percentage point increase | $ 1 |
Effect on total of service and interest cost, 1 - percentage point decrease | (1) |
Effect on accumulated postretirement benefit obligations, 1 - percentage point increase | 15 |
Effect on accumulated postretirement benefit obligations, 1 - percentage point decrease | $ (13) |